A train is running due north on metre gauge at a speed of 36km/h. What will be the emf generated between the rails, if the vertical component of the earth’s magnetic field at that place is 4 x 10-5 T?​

Dear Student,

Your question is incomplete. Here velocity and magnetic field are given, but along with those distance between the rails is also needed. Here i am considering the distance between the two rails as 2m.
 

Please find below the solution to the asked query:

Given information,
Velocity of the train V = 36 kmph = 10 m/s; Vertical component of magnetic field is Bvertical = 4×10-5 T.
So, EMF induced is,
e = BVl = 4×10-5×10×2 = 8×10-4 = 0.8×10-3 Ve = 0.8 mV

You can solve the problem for any value of distance between the rails by taking that value as "l" in the equation.


Hope this information will clear your doubts about the topic.

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Regards


 

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